*{
    margin: 0;
    padding: 0;
}
ul{
    list-style: none;
}
a{
    color: #333;
    text-decoration:none;
}
.b{
    background: rgba(248, 229, 229, 0.367);
}
body{
    background: rgb(249, 246, 227);
}
.header{
    height: 80px;
    width: 100%;
    border-bottom: 1px solid #ddd;
    box-sizing: border-box;
    background: #fff;
    position: fixed;
}
.nav-box{
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-evenly;
    /*align-items: center;*/
    /*justify-content: space-between;*/
    height: 40px;
    padding-top: 20px;
    font-size: 30px;
    color:#333;
}
.nav-box .nav{
    display: flex;
    font-size: 16px;
    color: #555;
}
.nav-box .nav li{
    padding-left: 40px;
}
.nav-box .nav .on{
    color:#333;
    padding-bottom: 10px;
    border-bottom: 2px solid #333;
}
.nav-box .nav a:hover{
    color: #333;
    padding-bottom: 10px;
    border-bottom:2px solid #333;
}
.banner{
    width: 100%;
    background:url(../img/cat1.jpg) no-repeat center center;
    height: 300px;
    text-align: center;
    line-height: 300px;
    color: #fff;
    text-shadow: 0 0 10px rgba(0,0,0,0.3);
    font-size: 30px;
    font-weight: bold;
}
.introduce{
    width:1200px;
    margin:0 auto;
    padding: 20px 0;
}
.introduce-tit{
    line-height: 50px;
    font-size: 20px;
    font-weight: 600;
    padding-bottom: 20px;
    color:rgba(24, 23, 23, 0.781)
}
.introduce-main{
    display: flex;
}
.introduce .l{
    margin-right: 20px;
}
.introduce .l img{
    border-radius: 50%;
}
.introduce-main .r{
    line-height: 50px;
    font-size: 18px;
    color:rgba(55, 51, 51, 0.562)
}
.main-box{
    width: 100%;
    margin:20px auto;
}
.flex-box{
    margin: 0 20% 0 20%;
    width: 60%;
    display: flex;
    flex-direction: row;
    flex-wrap: wrap;
    /*justify-content: space-around;*/
}
.blog{
    margin: 30px;
}